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Valinoti, Director <br /> Harney Lane Gas Monitoring Plan <br /> Page 2 <br /> From the plan, the maximum depth of each wellbore can not be <br /> determined. It is stated at the top of page 4 , "records do not <br /> identify the exact location and depth of the early trenches. " <br /> The following paragraph continues, "solid waste trenches were <br /> excavated to a 50-foot depth (after 1/75] with the excavated <br /> material being used for cover. The County planned to add lifts <br /> of about 120 feet or about 20 feet above the existing ground <br /> elevation. " There is an inconsistency in reporting. If 50-foot <br /> trenches were excavated and a 120 toot design elevation attained, <br /> how can this be 20 feet above the existing ground elevation? How <br /> will the maximum depth for wellres be determined? <br /> On page 5 it is reported that "each wellbore will be a minimum of <br /> 30 feet deep and 6" in diameter® " Figure 4 on page 7 indicates a <br /> 40 foot minimum depth of a wellbore. Please request <br /> clarification on the depth of wellbores (17783 .5 (c) (1) ) . <br /> Also, please request information regarding depth to groundwater <br /> ill relation to probe depth (17783 . 5 (c)-(l) (E) ) as wall as the ASTH <br /> designation for soil description (17783 .5(d) (1) ) . <br /> (4) Page 9- Please request that monitoring results be reported <br /> to both the LEA and the Hoard ( 7783 .13 (a) ) . Also, please <br /> request the information specified in 17783 . 13 (a) (5) be included <br /> in each monitoring report. <br /> R <br /> (5) Please be -reminded that the County, at a 9/25/90 meeting, <br /> agreed to monitor structures at the Labor Camp for methane. <br /> Staff request that these structures be monitored at least twice <br /> annually to insure that occupants are not being exposed to <br /> methane and other trace gas constituents. Please request that a <br /> specific monitoring program for the structures on the Labor Camp <br /> be reported. <br /> (6) Staff cannot determine by reading the plan if the gas <br /> monitoring network was designed by a registered civil engineer or <br /> a certified engineering geologist (17783 . 3 (a) (1) ) . Also, further <br /> specific information needs to be supplied in regards to the <br /> selection of monitoring points (17783 . 3 (a) (2) (A-F) ) . Please <br /> request clarification of these concerns. <br /> E 'd G0 :0z I6/Sc/b0 WOdd <br />